From: Antti Palosaari <crope@iki.fi>
To: Devin Heitmueller <dheitmueller@kernellabs.com>
Cc: "Aleksandr V. Piskunov" <aleksandr.v.piskunov@gmail.com>,
Markus Rechberger <mrechberger@gmail.com>,
Clinton Meyer <clintonmeyer22@gmail.com>,
Linux Media <linux-media@vger.kernel.org>
Subject: Re: LinuxTV firmware blocks all wireless connections / traffic
Date: Thu, 10 Sep 2009 18:55:12 +0300 [thread overview]
Message-ID: <4AA92160.5080200@iki.fi> (raw)
In-Reply-To: <829197380909100826i3e2f8315yd6a0258f38a6c7b9@mail.gmail.com>
Devin Heitmueller wrote:
> The URB size is something that varies on a device-by-device basis,
> depending on the bridge chipset. There really is no
> "one-size-fits-all" value you can assume.
I doubt no. I tested last week rather many USB chips and all I tested
allowed to set it as x188 or x512 bytes. If it is set something than
chip does not like it will give errors or packets that are not as large
as requested. You can test that easily, look dvb-usb module debug uxfer
and use powertop.
> I usually take a look at a USB trace of the device under Windows, and
> then use the same value.
I have seen logs where different sizes of urbs used even same chip.
regards
Antti
--
http://palosaari.fi/
next prev parent reply other threads:[~2009-09-10 15:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-09 21:43 LinuxTV firmware blocks all wireless connections / traffic Clinton Meyer
2009-09-09 21:59 ` Devin Heitmueller
2009-09-10 9:14 ` Aleksandr V. Piskunov
2009-09-10 10:58 ` Markus Rechberger
2009-09-10 12:45 ` Aleksandr V. Piskunov
2009-09-10 12:48 ` Aleksandr V. Piskunov
2009-09-10 13:12 ` Antti Palosaari
2009-09-10 13:41 ` Aleksandr V. Piskunov
2009-09-10 13:47 ` Antti Palosaari
2009-09-10 14:48 ` Antti Palosaari
2009-09-10 15:26 ` Devin Heitmueller
2009-09-10 15:55 ` Antti Palosaari [this message]
2009-09-10 16:12 ` Devin Heitmueller
2009-09-10 16:48 ` Antti Palosaari
2009-09-10 17:17 ` Devin Heitmueller
2009-09-10 20:29 ` Antti Palosaari
2009-09-10 20:45 ` Devin Heitmueller
2009-09-10 17:16 ` Aleksandr V. Piskunov
2009-09-10 19:39 ` Aleksandr V. Piskunov
2009-09-11 14:38 ` Antti Palosaari
2009-09-11 17:50 ` Aleksandr V. Piskunov
2009-09-11 18:01 ` Devin Heitmueller
2009-09-11 19:47 ` Antti Palosaari
2009-09-12 15:46 ` CityK
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